Docke



(No Model.) 7

J. H. H. PENRUDDOOKE.

LOGOMOTIVE FIRE BOX. No. 306,857. I Patented 0013.21, 1884.

' N. PETERS, mmume n mr. wmmm. n. c.

UNrTEn STATES ATENT Truce.

JOHN H H. PENRUDDOCKE, OF FORT GRATIOT, MICHIGAN.

ocomorxvs FIRE-BOX.

SPECIFICATION forming part of Letters Patent No. 306,857, dated October21, 1884.

Application filed June 18, 1984. (No model.)

To aZZ whom it may concern:

Be it known that I, JOHN H. H. lnunnn- DOOKE, of Fort Gratiot, in thecounty of St. Clair and State of Michigan, have invented new and usefulImprovements in Locomotive Fire-l3oxes; and I do hereby declare that thefollowing is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, which form a part of thisspecification.

This invention relates to certain new and useful improvements in themeans employed for securing the tubes in a locomotive fire-box for thesupport of a brick arch therein, ordinarily termed a smok e or"deflecting" arch. Heretofbre it has been customary to secure such tubesin the sheets which form the waterlegs by an external thread upon thetube engaging with a female thread formed in the sheets, and this methodof securing so weakened the tubes at this point by the cutting of thethread that the expansion and contraction of the tubes under theinfluence of the tire and extinguishment of the same would cause suchtubes to break at these weak points, while at the same time, in case ofthe necessary replacing of the tubes, much trouble was had in takingoutthe old ones and inserting the new. v

The object of the present invention is to provide means for supportingand sustaining such tubes which support the brick arch in such a waythat none of the difficulties to which I have above referred occur.

Figure l is a vertical longitudinal section through the fire-box. Fig. 2is an enlarged detail showing the tube and method of securing the sameat one end, the opposite end he- 1ng secured by a duplication of themeans shown. Fig. 3 is a cross-section on the line X X in Fig. 1.

In the accompanying drawings, which form a part of this specification, AA represent the waterdeg as usually constructed, which surrounds thefire-box G, such water-legs being formed wlth lnner and outer plates, inthe usual manner.

tle distance above the position usually occupied by the grates,and thenpass through the inner sheet of the water-leg at the rear.

0 are solid brass plugs screwed into the outer plates. to the front andrear of the water-legs, the inner face of these plugs being conicallyrecessed. as shown in section in Fig. 2, and the ends of the tubes areslightly coned upon the outside to fit the con ical recesses in theplugs C, so that when the latter are screwed to place the tubes arecentered in such recess, and the plugs thus form the resistance-pointsfor the expansion, longitudinally, of such tubes. These plugs arescrewed, as already remarked, into the outer plates, E,of the water-legsof the fire-box. A copper ring, D, is driven on to the outside of thetube B at the point where such tube passes at either end through theinner plates. F, of the water-leg, and fills the orifice formed thereinforthe passage of the tubes. When these tubes are put in placesuccessively, the soft copper-is calked in the usual way, and forms atightjoint at that point, and the rings, being softer than the irontubes, allow of a longitudinal contraction and expansion without theirbeing any strain upon the tubes at this point. Bricks I are formed withlips a, and the bricks are of sufficient length to till the spacebetween each pair of tubes, the lips (shown in section in Fig. 3)resting upon the upper sides of such tubes above their axis, and by thepeculiar construction of the bricks they hold themselves in place.

\Vhat I claim as my invention is 1. In combination with the outer shellofa double-walled fire-box and the tubes which pass through thesame,-t-he plugs O, threaded within said outer shell, and constructed toclose the open ends of said tubes and retain them in place, as and forthe purposes set forth.

2. In combination with the lire-box of a locomotive-engine, suchfire-box being surrounded by the usual water-legs, and as a means forsecuring the tubes therein, the combination of the plugs, as described,and the rings with the inner and outer sheets of such water-leg,substantially as and for the purposes s'pecified.

JOHN H. II. PENRUDDOOKE,

Witnesses:

H. S. SPRAGUE, E. SouLLY.

